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Risk of seroreversion in the antibody durability data set. The Kaplan-Meier estimate indicates that the risk of seroreversion was significantly higher for the participants with lower antibody titer at the time of study enrollment (n = 56 < 1:800 titer [orange]; n = 81 ≥ 1:800 titer [pink]). Of the 137 participants included in the antibody durability data set, only eight (6%) participants seroreverted, all of which were initially in the lower antibody titer group.
